The point of ​​this move is to restrict the development of the c8-bishop. The main ideas of White's setup are using the outpost on e5 and keeping this bishop trapped behind the pawn chain.
2... d7d5  3. e4d5  3... c6d5  4. f1d3 Carlsen has played this system many times, with both White and Black. 4... g8f6 